= 8.58 + 4(8/15) - 3(3/16)
= 8.58 + (4 8/15) - (3 3/16)
= 8.58 + (32/15) - (9/16)
= 8.58 + 2.1333 - 0.5625
= 10.7133 - 0.5625
= 10.1508